Data-directed programming in Haskell (SICP 2.4.3)

I have a copy of SICP, or as it is also known, The Wizard Book . This book is widely praised, but I can&rsquo;t take the time to work my way through all of it. Instead, I&rsquo;m going to occasionally jump into the parts of it that look interesting. Last week, we looked at tagged data in Haskell. The authors of SICP weren&rsquo;t convinced that&rsquo;s the best approach, so they move on to…